Riveting tool



I Dec. 16, 1958 J. F. MHAMLIN ETAL RI-VETING TOOL 2 Sheets Sheet 1 FiledApril 25, 1955 INVENTORS JERRY HAMLIN R0) M MAGNUSON RALPH 7K DAUGHERT."

By Q

ATTORNEY United States Patent RIVETING TOOL Jerry F. Hamlin, San Rafael,Roy M. Magnuson, Santa Clara County, and Ralph K. Daugherty, San Jose,Calif., assignors, by direct and mesne assignments, of one-sixth to saidJerry F. Hamlin, one-sixth to Bess E. Hamlin, one-sixth to Ralph M.Cuykendall, and one-sixth to Marie Cuykendall, all of San Francisco,one-sixth to Louise Newman, and one-sixth to Louis Newman, both ofOakland, Calif.

Application April 25, 1955, Serial No. 503,578

Claims. (Cl. 218-34) The present invention relates to riveting, and isconcerned more particularly with a riveting tool for blind rivets havinga riveting part or pin which must be driven home during the rivetingoperation, wherein the rivet center pin is assembled in the rivet bodyasa part of the riveting operation to effect upsetting of the rivet, andwherein smoothing off of the center pin at the end of the operation isalso effected.

In using the type of blind rivets having center pins or rivet upsettingmembers, which remain as a part of the rivet after the rivetingoperation, it has been customary to pre-assemble the center pins on therivet bodies at the factory so that each rivet is shipped as a completeunit ready for insertion in the members to be riveted, this unitincluding the rivet element per se, and the center pin assembledtherein.

In the instant invention, there is disclosed a riveting tool wherebysuch blind rivets are provided with the rivet bodies and center pinsseparate and the two components are assembled automatically on the job,the center pin driven into the rivet body, and the head of the pinsmoothed off, all as a part of the riveting operation. This invention isalso concerned with a tool which is of an improved construction,economical to manufacture, and reliable in operation. Also, the tool ofthe present invention is designed for use with varying sizes of rivetassemblies, and accordingly embodies an automatic center pin feed,wherein center pins of different lengths are connected together orintegrally formed as a stick, and the tool can be adjusted to thedifferent spacings between the pins of the stick, so that accurate,reliable feeding of the rivet stick pin-by-pin will be effected.

The above and other objects of the invention will be apparent from thefollowing description of a preferred embodiment of the invention, takenin conjunction with the accompanying drawings, in which:

Figure l is a side elevational view of the riveting tool.

Figure 2 is a longitudinal sectional view of the riveting tool, certainparts being shown in elevation, and others broken away.

Figure 3 is a fragmentary sectional view taken in a plane indicated bythe line 3-3 in Figure 2.

Figure 4 is a sectional view, similar to Figure l, but showing the toolat the end of a feed stroke, and including a center pin stick for rivetstherein.

Figure 5 is an enlarged sectional view of the chuck jaws before thestart of a rivet feeding operation.

Figure 6 is a view similar to Figure 5 showing similar parts in anintermediate position during a feeding stroke.

Figure 7 is a view similar to Figures 5 and 6 showing the jaws at theend of a feed stroke with a center pin in projecting position and thejaws positioned to effect cut-off and driving thereof.

Figure 8 is a view similar to Figure 7 but illustrating one possibleposition of a center pin as the chuck jaws ice complete the cut-off ofthe center pin from a center pin stick, and at the start of upsetting ofthe rivet.

Figure 9 is a view similar to Figure 8 showing the condition of a rivetat the end of a riveting operation, with the chuck jaws in the positionshown in Figures 4 and 7.

Figure 10 is a plan view of one of the chuck jaws.

Referring first to Figures 1 and 2, the riveting tool comprisesgenerally a central body 10, a sleeve extension 11, and a hammer 12carried by a tubular extension and guide 13 at the rear of the body 10,a suitable stopscrew 14 being provided for the hammer 12. The body 10 isshaped in general to form a handle. As seen more clearly in Figure 2,the body has a central bore 16 extending therethrough, from a reducedthreaded end 17 on which the sleeve extension 11 is engaged to aninternally threaded bore portion 18 of the body within which the tubularguide extension 13 is secured.

The sleeve extension 11 (Figures 2, 4 and 5) provides means for housing,and in part operating, a pair of identical cut-off and feeding chuckjaws 21, which are identical in construction, and only one of which willbe described in detail. The chuck jaws 21 have a floating pivotalmounting in the tool, and are spring urged to the retracted positionthereof illustrated in Figure 2, being responsive to internal pressureto move to an expanded projected position in the operation of feeding acenter pin, as described in detail hereinafter. These jaws 21 havecomplementary concave drive faces 22, as shown, to fit a round head typeof rivet. From the face 22 of a jaw, the outer jaw surface tapersbackwardly and outwardly to an enlarged portion 21a providing a shoulder21b engaging the end 25 of the sleeve 11. Within an enlarged bore 23 ofthe sleeve 11, the outer face of each chuck jaw is tapered inwardly toprovide a cam surface 24 for engagement with the end edge of the bore23, and this tapered portion or cam surface 24 being substantiallyfrusto-conical in form corresponds to the circular contour of the sleeve11. At its inner end, each jaw 21 is provided with an inward extensionor pivot hook 26 which engages somewhat loosely in an annular groove 27of a control member 28, said groove having one rounded corner. Oppositethe hook 26, each jaw 21 has a rounded guide edge 29. The control member28 is slidably engaged with an enlarged internal portion 30 of thesleeve 11, and a reduced rear end 31, which provides clearance for aspring 32 which seats at one end against a washer 33 within theextension sleeve 11, and its other end engages a washer 34, which isconnected to the control member 28.

From the above description, it will be seen that the jaws 21 (Figures 2,4 and 5) are spring urged to the position shown in Figure 2, but can beyieldably spread from this position to the position shown in Figure 4 bypressure against the internal cam surfaces 36 thereof, terminating inopposed mating knife edges 37.

It will be noted also that the guide member 28 has a central bore 38which registers with the bore 16, and, as shown in Figure 4, formstherewith a magazine adapted to receive a center pin stick 41 consistingof a series of center pins 42 for the type of blind rivet that is seenmost clearly in Figure 7, where the rivet body 45 is supplied separatelyfrom the center pin. In this type of rivet, shown as a roundhead rivet,the shank of the rivet body has four slots 43 in its end which isinserted through the blind hole or opening, providing four separatedupsetting fingers 44. The center pin 42 which is tapered at one end 42ais adapted to be driven into the rivet body 45 to upset the rivetingfingers 43 and thereby secure the rivet in place in the blind hole. Thecenter pin stick shown is of the type described and claimed in thecopending application of Ralph M. Daugherty, Serial No.

' '3 505,146, filed May 2, 1955 for Center Pin Stick, since abandoned.

Other types of sticks can be employed for providing the series of center,pirrs,.such as, for example, a plain round or otherwise shaped rod. ofmaterial capable of being cut in two. Also, a series of separate centerpins can be employed using any suitable means for pushing them throughthe magazine.

Means are provided for feeding the center pin stick along its receptacleor passage within the riveting tool, and this means can be adjusted tofeed different lengths of center pins, as required for diflerent lengthsof rivets. To provide feed means the body 10 has a radial machined slot51 (Figures 3 and 4) which intersects its center bore 16, adjacent butspaced from the bore portion of biggest diameter, providing two guidesurfaces 5r"; (Figures 2, 3 and 4) for a feed pawl 52, the surfaces 50terminate in arcuate end portions 50a. The pawl 52 has a slidingpivotal, connection by means of a slot 54 therein on a pin 53 secured inthe opposite walls ofa generally channelshaped lever or handle 61 whichis pivoted to the body by respective pins 62. The pawl 52 is urgedclockwise, as viewed in Figures 2 and 4, by a tension spring 58connected between the pawl 52 and a bent ear 59 of the handle 61. In theinactive position of the pawl 52, shown in Figure 4, it is urged toplace its feed tooth 52a out of active position, i. e. resting on onepair of arcuate slot surfaces 50a. In the active positionof the pawl,shown in Figure 2; the spring 58 urges the tail 56 of the pawl against astop slide or feed gauge 57 therefor.

The stop slide 57 (Figures 2 and 4) has a plurality of positions in aselected one of which it is maintained by a pin 71, engaging either oneof two holes 72 in the handle 61, and a guide rivet 73 which is securedin the slide 57 and engages a slot 74 in the handle 61. The stop slide57 is sufficiently flexible so that the pin 71 which is riveted thereincan be disengaged from one of the apertures 72 and moved along untilitsnaps into the other aperture 72.

It will be noted that the feed pawl 52 (Figure 2) intersects the bore 16sufliciently to seat within one of the grooves 41a of the center pinstick, to effect sliding of this center pin stick to the right as shownin Figure 4, and the extent of withdrawal or backward movement of thefeed pawl 52 will determine whether a certain length group of pins ispicked up thereby. With the pin 71 in one of the holes a selected lengthgroup of pins will be picked up, say the /8 and /8 length pins, and withthe rivet 71 in the other hole 72, the longer group of pins will bepicked up, for example, the A" or %,7 length pins.

In operation, the riveting tool is supplied with a center pin stick 41,which is placed in the central bore or magazine, this condition of theparts being illustrated in Figure 5, for example. Then the handle 61,which is grasped by the band also engaging the body 10, is moved fromthe position shown in Figure 2 to that shown in Figure 4, and duringthis movement the tapered end of the endmost center pin 42 will engagethe inner cam surfaces 36 of the chuck jaws 21, and open t ese jaws,causing the guide member 28 to move to the right from the position shownin Figures 2 and 5 to that illustrated in Figure 6. As a result, thecenter pin is pushed between the jaws 21, which are spring urgedtogether, and when the stick 41 reaches the position shown in Figure 7and the jaws 21 reach the next adjacent groove 41a of the center pinstick, they will snap into the annular groove 41a as shown in Figure 7,engaging the straight shoulder 75 of the groove with one side of theface of the cutting teeth, and the tapered shoulder 42a with the otherside of these teeth.

In this condition of the parts, a rivet body 45 is placed over theprojecting center pin of the stick, as indicated in Figure 7, and thisassembly of parts is inserted into a pair of members 80 and 81 which areto be riveted together from one side thereof. Then the hammer 12 isgrasped in the other hand and sharply impacted repeatedly against thebody member 10, causing a driving of the sleeve extension 11 up overthecam surfaces 24 of the respective chuck jaws 21, thus tending toforce the jaws 21 together to cut the stick 41 at the same time that thelengthwise impact is transmitted through the riveting tool to the endcenter pin 42 to drive it into the body of the rivet. When the centerpin 42' engages the tapered inner edges of the upsetting portions 43 ofthe rivet body 42, and resistance is encountered by the center pin inits travel, the jaws 21 will begin to bite together as they are forcedback into the tool extension 11. Depending upon the hardness of thematerial of the center pin stick, and the resistance of the constructionof the particular rivet being used, at some time during the rivetingoperation the endmost center pin will be clipped or out free from thecenter pin stick, as seen in Figure 8. The tool in effect shears off thecenter pin as it is being assembled in the rivet, and then is in aclosed position to drive it on into the rivet, upsetting the rivet atthe same time. After the cndmost center pin, which is being driven home,has been cut free from the tool, there is certain relative rotationalmovement that will occur during the driving operation, so that thecavity formed in the end of the jaws 21, which matches the sphericalshape of the head of the rivet body 45, will smooth off the cut end ofthe center pin which is being driven home, and at the end of theoperation a smooth appearing rivet head will be provided.

While we have described a preferred method of carrying out ourinvention, and a preferred structural embodiment of the invention, itshould be apparent that the invention is capable of variation both as tomethod and as to structure from the particular forms described so thatthe scope thereof should be limited only by the proper scope of theclaims appended hereto.

We claim:

1. In a tool for assembling and installing blind rivets of a typeemploying a rivet upsetting center pin adapted to be driven into andleft in place in the body of the rivet, a tubular tool body havingpassage means to receive a center pin, a mounting sleeve slidablymounted in said tubular body adjacent one end thereof, spring meansurging said mounting sleeve inwardly from said adjacent end, saidmounting sleeve having groove means therein extending transversely ofthe length thereof, a pair of chuck jaws having portions engaging saidgroove means for rocking movement of the jaws therein, said jaws havingjaw portions adapted to open to pass a center pin to a position with thecenter pin in external driving relation with respect to said jaws,whereby impact against said jaws will drive said pin into the rivet bodyassociated therewith, said body and said jaws being connected totransmit driving forces therebetween.

2. In a tool for assembling and installing blind rivets of a typeemploying a rivet upsetting center pin adapted to be driven into andleft in place in the body of the rivet, an elongated tool body having abore therein to receive center pin means, means forming a radial slotpartially intersecting said here, a handle pivotally mounted on saidbody, a feed pawl pivotally mounted on said handle and having a feednose engaged in said radial groove and entering said bore, and springmeans urging said feed pawl in a direction to engage said center pinmeans in said bore, whereby rocking movement of said handle with respectto said body causes feeding movement of said feed pawl and progressionof said center pin means along said bore.

3. In a tool for assembling and installing blind rivets of a typeemploying a rivet upsetting center pin driven into and left in place inthe body of the rivet, an elongated tool body having a bore therein toreceive center pin means, means forming a radial slot partiallyintersecting said bore, a handle pivotally mounted on said body, a feedpawl pivotally mounted on said handle and having a feed nose engaged insaid radial groove and entering said bore, spring means urging said feedpawl in a direction to engage said center pin means in said bore,whereby rocking movement of said handle with respect to said body causesfeeding movement of said feed pawl and progression of said center pinmeans along said bore, and means for controlling the extent of movementof said feed pawl, including an adjustable member forming a stoptherefor.

4. In a tool for assembling and installing blind rivets of a typeemploying a rivet upsetting center pin adapted to be driven into andleft in place in the body of the rivet, an elongated tool body having abore therein to receive center pin means, means forming a radial slotpartially intersecting said bore, a handle pivotally mounted on saidbody and having a feed nose engaged iu said radial groove and enteringsaid bore, spring means urging said feed pawl in a direction to engagesaid center pin means in said groove, whereby rocking movement of saidhandle with respect to said body causes feeding movement of said feedpawl and progression of said center pin means along said bore, and pinresponsive jaws on said body spring urged to retracted closed position,said jaws having inner cam surfaces for engagement by said pin means,and being responsive to feeding movement of said pin means to allowfeeding of a pin therethrough and then operating to close under theurgency of an impact against said jaws to sever the pin and to drive itinto the rivet body.

5. In a tool for assembling and installing blind rivets of a typeemploying a rivet upsetting center pin driven into and left in place inthe body of the rivet, an elongated tool body having a bore therein toreceive center pin means, means forming an opening partiallyintersecting said bore, feed means positioned in said last mentionedmeans for engaging and causing feeding movement of said center pin meansalong said here, and pin responsive jaw means on said tool body, saidjaw means being spring urged-to retracted partially closed position,said jaws having opposed knife edges and inner cam surfaces adjacentsaid edges for engagement by said pin means and being responsive tofeeding movement of said pin means to spread said jaw means and therebyallow feeding of a pin therethrough and, said tool having means thenoperating to farther close said jaw means under the urgency of an impactdelivered to said jaw means through the forward portion of said toolbody to sever the pin and to drive said pin into the rivet body.

6. In a riveting tool, a body having a longitudinal bore therein, acenter pin in said bore, a sleeve extension mounted on one end of saidbody, a pair of chuck jaws movably mounted in said sleeve extension, agenerally cylindrical carrier slidably mounted in said sleeve extensionand having an annular groove, hook means on said jaws engaging saidgroove whereby said carrier and said jaws are connected to move back andforth in said sleeve extension together, said jaws including outer camsurfaces engaging said sleeve extension for controlling opening andclosing movement thereof and pin responsive inner cam surfaces, impactmeans at other end of said body, and pin feed means.

7. A riveting tool for installing blind rivets by driving a center pininto each of said rivets from the head end thereof and cutting off saidpin, said tool comprising a sturdy elongated body structure providing alongitudinal extending passage for a rivet pin stick having a pluralityof notches uniformly spaced therealong and dividing said stick into aplurality of said pins, a jaw structure at one end of said bodystructure including openable jaws, resilient means resiliently urgingsaid jaws toward a closed jposition, said jaws having cooperatingcutting edges thereon directed toward each other and movable intocontact with each other to cut a pin from said stick, feedingmeansengaging in said stick notches operable to feed one of such pinsthrough said jaws so that said jaws partly close under the urgency ofsaid resilient means with said cutting edges in one of said notches,said body structure being provided with an unobstructed impactreceivingsurface rearwardly of the jaw-structure-end of said body structure andhaving means engaging said jaws to farther close said jaws when impactsare applied to said body structure in a direction longitudinally throughsaid body structure toward said jaws so that said impacts may beemployed simultaneously to drive said one pin into a rivet and to cut01f said one pin.

8. A riveting tool as defined in claim 7 in which said tool has aslidable hammer member on said body structure for producing saidimpacts.

9. A riveting tool as defined in claim 7 in which said jaws compriseelongated members extending longitudinally from the body structure ofsaid tool, said jaws having cam portions engaged by said portions ofsaid body structure to force said jaws toward said closed position.

10. A riveting tool as defined in claim 7 in which said jaws compriseelongated members extending longitudinally of said tool, said jawshaving one of their ends positioned outside said body structure andhaving said cutting edges on said ends, said jaws also having camportions intermediate their ends engaged by said body structure to forcesaid jaws toward closed position, the other ends of said jaws beingpoistioned within said body structure.

References Cited in the file of this patent UNITED STATES PATENTS1,174,937 Merrick Mar. 7, 1916 2,389,479 Austin Nov. 20, 1945 2,400,354Jensen May 14, 1946 2,416,474 Frank Feb. 25, 1947 2,421,474 Alter June3, 1947 2,595,551 Springate May 6, 1 952 2,622,781 Polson Dec. 23, 1952FOREIGN PATENTS 122,504 Australia Oct. 15, 1946 371,817 Italy June 5,1939

